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Commit9b8aa09

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Don't use EV_CLEAR for kqueue events.
For the semantics to match the epoll implementation, we need a socket tocontinue to appear readable/writable if you wait multiple times withoutdoing I/O in between (in Linux terminology: level-triggered rather thanedge-triggered). This distinction will be important for later commits.Similar to commit3b790d2 for Windows.Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>Discussion:https://postgr.es/m/CA%2BhUKGJAC4Oqao%3DqforhNey20J8CiG2R%3DoBPqvfR0vOJrFysGw%40mail.gmail.com
1 parent7bc84a1 commit9b8aa09

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‎src/backend/storage/ipc/latch.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -991,7 +991,7 @@ WaitEventAdjustKqueueAdd(struct kevent *k_ev, int filter, int action,
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{
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k_ev->ident=event->fd;
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k_ev->filter=filter;
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k_ev->flags=action |EV_CLEAR;
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k_ev->flags=action;
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k_ev->fflags=0;
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k_ev->data=0;
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AccessWaitEvent(k_ev)=event;
@@ -1003,7 +1003,7 @@ WaitEventAdjustKqueueAddPostmaster(struct kevent *k_ev, WaitEvent *event)
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/* For now postmaster death can only be added, not removed. */
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k_ev->ident=PostmasterPid;
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k_ev->filter=EVFILT_PROC;
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k_ev->flags=EV_ADD |EV_CLEAR;
1006+
k_ev->flags=EV_ADD;
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k_ev->fflags=NOTE_EXIT;
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k_ev->data=0;
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AccessWaitEvent(k_ev)=event;

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